According to the SAP Help Portal2, to update an MSMP Workflow and apply the update to both new and existing requests that have not yet been processed, one of the settings that must be configured is Task Settings. Task Settings define how the workflow tasks are handled by the system, such as whether they can be forwarded, escalated, or expired. One of the task settings is Update Existing Requests with New Task Settings. If this setting is set to Yes, then any changes made to the task settings will apply to both new and existing requests. Therefore, C is the correct answer. A, B and D are not valid settings for applying workflow updates to existing requests, as they are related to other aspects of workflow configuration, such as stage details, end user personalization, and access request validation parameters. Reference: 2 https://help.sap.com/doc/e2ccae7ee6354b169cf845cd665e07fe/1.0%202016-07/en-US/frameset.htm?frameset.htm